Related Questions

The pressure of air at the beginning of the compression stroke is ________ the atmospheric pressure.
A Equal to
B Less than
C More than
D None of these
When the temperature of air leaving the inter-cooler, in a two stage compression with inter-cooler, is ________ the original atmospheric air temperature, then the intercooling is known as perfect or complete intercooling.
A Equal to
B Less than
C More than
D None of these
In a four stroke cycle petrol engine, the pressure inside the engine cylinder during the suction stroke is __________ the atmospheric pressure.
A equal to
B below
C above
D middle
In a four stroke I.C. engine, the turning moment during the compression stroke is
A positive throughout
B negative throughout
C positive during major portion of the stroke
D negative during major portion of the stroke
Atmospheric pollution caused by the exhaust gas of supresonic transport air-crafts is mostly in the atmospheric region called
A Thermosphere
B Stratosphere
C Troposphere
D Mesosphere
Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate?
A CO
B SO2
C NOx
D CFC (chloro fluoro carbons)
A two stroke cycle engine gives ________ the number of power strokes as compared to the four stroke cycle engine, at the same engine speed.
A Half
B Same
C Double
D Four times
The pressure of steam in the engine cylinder at the beginning of the stroke is ________ the boiler pressure.
A Equal to
B Less than
C Higher than
D None of these
Multistage compression of air as compared to single stage compression offers the advantage of
A Power saving per unit weight of air delivered
B Moisture elimination in the inter-stage cooler
C Increased volumetric efficiency
D All of the above
The pressure and temperature at the end of compression stroke in a petrol engine are of the order of
A 4 - 6 kg/cm2 and 200 - 250°C
B 6 - 12 kg/cm2 and 250 - 350°C
C 12 - 20 kg/cm2 and 350 - 450°C
D 20 - 30 kg/cm2 and 450 - 500°C

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